Particle Acceleration at the Pileup Collision of the Twin Shock

Xinjiang Natural Science Foundation [2019D01A100]; Xinjiang Heaven Lake Hundred-Talent Program; NSFC, National Natural Science Foundation of China [11673056]; CAS Key Laboratory of Solar Activity, National Astronomical Observatories; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education; China Scholarship Council (CSC), China Scholarship Council; Supercomputer Center of University of Arizona